I was talking to Sebastian from MRTV and he wanted me to confirm here what he also sees.
I have both the 5k+ and 8k and am able to test a subtle latency issue sebastian was talking about here: Can You Run Skyrim VR On The Pimax 8K / 5K Plus With A GTX 1080ti? Pimax 8k vs Vive Pro Comparison! - YouTube
Just wanted to say after having more time with the 8k vs. the 5k+ he was completely correct that it has more latency than the 5k+!
As an example: if you look at a single star in the default pimax home environment and wobble your head back and forth a star moves about maybe 20-25 pixels on the 8k (I would estimate 20-25ms latency then) where as on the 5k+ maybe 2 or 3 pixels max just like on the Vive and Rift (0-5ms timewarped/reprojected latency estimate on vive/rift I am estimating)
I reported on the pimax developer forum about the 8k latency and they are looking into it. Guessing it’s probably the upscaler as even the Oculus go at 60hz or 72hz doesn’t have this sort of wobble. If you haven’t used many other headsets you may never notice though, but I did.
Also just wanted to let you guys know. The 5k+ is clearly the better headset (and best headset on the market) the clarity is great compared to the 8k, low sde. Blacks could of course look better but it’s worth it. (Really wish it had the blacks and colors of the odyssey+'s oled, or anti-sde!) I don’t even mind the mild black smear on odyssey+ tbh, worth it. But it’s fine. 5k+ reminds me of an oculus go’s sde and blacks in a way but maybe better which isn’t that bad.
I will be showing off the headsets at the Chicago Pimax backer meetup tomorrow and will try to show the backers what I see with the 8k. (it’s extremely mild, but I feel even 20ms of smallest latency can subcosciously affect feelings of “presence” in vr)
Anyways, thank you for the accurate reporting Sebastian! I have to say I am in complete agreement with your reviews.
Edit: Doc_ok (vr researcher) messaged me with a short clip from VRLA where he covers motion-to-photon latency VRLA Summer Expo 2016: How VR Works A Perceptual Point of View - YouTube
In his message he said “That discussion directly references impact motions, same idea as the “knock test” or “wobble test.””
Edit2: Update 12/27/18: Another test you guys can try to make this easier to spot:
When in steamvr home put your left eye where right eye is supposed to be in the hmd (Yes this sounds weird but hear me out! lol) hold the virtual vive controller up on front of you and stare at it. And make your right eye look at the real vive controller in real life, left eye virtual one. The two should converge into one controller.
Now that the virtual one and real one line up perfectly, wave the controller around and see if your left eye lags behind the real controller on right eye. I did this yesterday only on the 5k+ so far and it was a perfect match. I could count maybe one or two pixels delay.
You shoud also wobble the hmd in your hand when doing this test and see if the virtual controller wobbles compared to real life one! On 5k+ it basically holds perfectly in place like real life controller in right eye. tldr; 8k will wobble a lot when you shake hmd compared to real life controller doing this sort of mixed reality test.
Update:1/12/19 road to vr confirmed 8k latency after ces here https://www.roadtovr.com/pimax-8k-5k-plus-big-improvements-hands-on-ces-2019/ pimax seems unfamiliar with the issue he said.